---
title: 配置 Pod 初始化
content_template: templates/task
weight: 130
---

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---
title: Configure Pod Initialization
content_template: templates/task
weight: 130
---
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This page shows how to use an Init Container to initialize a Pod before an
application Container runs.
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本文介绍在应用容器运行前，怎样利用 Init 容器初始化 Pod。
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}

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## Create a Pod that has an Init Container

In this exercise you create a Pod that has one application Container and one
Init Container. The init container runs to completion before the application
container starts.

Here is the configuration file for the Pod:
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## 创建一个包含 Init 容器的 Pod

本例中您将创建一个包含一个应用容器和一个 Init 容器的 Pod。Init 容器在应用容器启动前运行完成。

下面是 Pod 的配置文件：

{{< codenew file="pods/init-containers.yaml" >}}

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In the configuration file, you can see that the Pod has a Volume that the init
container and the application container share.

The init container mounts the
shared Volume at `/work-dir`, and the application container mounts the shared
Volume at `/usr/share/nginx/html`. The init container runs the following command
and then terminates:
-->

配置文件中，您可以看到应用容器和 Init 容器共享了一个卷。

Init 容器将共享卷挂载到了 `/work-dir` 目录，应用容器将共享卷挂载到了 `/usr/share/nginx/html` 目录。
Init 容器执行完下面的命令就终止：

    wget -O /work-dir/index.html http://kubernetes.io

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Notice that the init container writes the `index.html` file in the root directory
of the nginx server.

Create the Pod:
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请注意 Init 容器在 nginx 服务器的根目录写入 `index.html`。

创建 Pod：

    kubectl create -f https://k8s.io/examples/pods/init-containers.yaml

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Verify that the nginx container is running:
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检查 nginx 容器运行正常：

    kubectl get pod init-demo

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The output shows that the nginx container is running:
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结果表明 nginx 容器运行正常：

    NAME        READY     STATUS    RESTARTS   AGE
    init-demo   1/1       Running   0          1m

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Get a shell into the nginx container running in the init-demo Pod:
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通过 shell 进入 init-demo Pod 中的 nginx 容器：

    kubectl exec -it init-demo -- /bin/bash

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In your shell, send a GET request to the nginx server:
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在 shell 中，发送个 GET 请求到 nginx 服务器：

    root@nginx:~# apt-get update
    root@nginx:~# apt-get install curl
    root@nginx:~# curl localhost

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The output shows that nginx is serving the web page that was written by the init container:
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结果表明 nginx 正在为 Init 容器编写的 web 页面服务：

    <!Doctype html>
    <html id="home">

    <head>
    ...
    "url": "http://kubernetes.io/"}</script>
    </head>
    <body>
      ...
      <p>Kubernetes is open source giving you the freedom to take advantage ...</p>
      ...

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<!--
* Learn more about
[communicating between Containers running in the same Pod](/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume/).
* Learn more about [Init Containers](/docs/concepts/workloads/pods/init-containers/).
* Learn more about [Volumes](/docs/concepts/storage/volumes/).
* Learn more about [Debugging Init Containers](/docs/tasks/debug-application-cluster/debug-init-containers/)
-->

* 进一步了解 [相同 Pod 中的容器间的通信](/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume/)。
* 进一步了解 [Init 容器](/docs/concepts/workloads/pods/init-containers/)。
* 进一步了解 [卷](/docs/concepts/storage/volumes/)。
* 进一步了解 [Init 容器排错](/docs/tasks/debug-application-cluster/debug-init-containers/)。

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